Authorized domain in exchange 2010 would not send email to internet but internally to main domain

Manifest Man

2/28/23, 11:56 AM

An authorized domain authorized-domain.tld in exchange 2010 with main domain main-domain.tld would not send email to internet but internally to main domain.

Reproduced / describde scenario:

User opens outlook client 2010 and binds the authorized domain email account e.g.: [email protected]
After account loaded and from this account, user then composes an email to [email protected] and [email protected]
Then user send the composed email to both email-adresses
Lastly user gets only from the email [email protected] an NDR from the NoSpamProxy Gateway with following code #550 5.4.4 Unable to relay ##

I have checked out the NoSpamProxy rules and also the send connectors of exchange 2010 to the internet, but nothing suspect out there.

I suspect a missing DKIM selector (could not find one selector for authorized-domain.tld on main-domain.tld TXT records) that should allow exchange 2010 Server with the main domain main-domain.tld to send emails externally as authorized-domain.tld, since MX record for authorized-domain.tld accordently points to main-domain.tld.

Do you have any ideas on this one, am i right or am i missing something tho ?

Thanks for checking out!

0 + 0

proxy

dkim

exchange-2010

Ivan_Wang

3/1/23, 2:38 AM

1. How did you add this authorized domain(***authorized-domain.tld***) to your organization? Is the process like the following? **Add authorized-domain.tld to DNS suffix** -> **Add this domain to accepted domain** -> **Create an email address policy with this domain** -> **Use this domain suffix for your mailbox(Email Address and UPN)** 2. Could you use this authorized domain to successfully send emails to another external email address(e.g. outlook.com, gmail etc.)?

Ivan_Wang

3/1/23, 2:42 AM

3. What're the configurations of your send connector?(If you attach them, please don't forget to alter any sensitive info.)

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Authorized domain in exchange 2010 would not send email to internet but internally to main domain

TH: โดเมนที่ได้รับอนุญาตใน Exchange 2010 จะไม่ส่งอีเมลไปยังอินเทอร์เน็ต แต่เป็นการภายในไปยังโดเมนหลัก

RO: Domeniul autorizat în schimbul 2010 nu ar trimite e-mail la internet, ci intern la domeniul principal

RU: Авторизованный домен в exchange 2010 не будет отправлять электронную почту в Интернет, а внутренне в основной домен.

VI: Tên miền được ủy quyền trong Exchange 2010 sẽ không gửi email tới internet mà gửi nội bộ tới tên miền chính

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